z-push auth against IMAP hosteurope

I am trying to auth against the IMAP server of hosteurope. But all the time I get following errors, what should I do to get the auth mechanism run? Port 143 is not working as it seems to force the backend to auth as plain. Usually port 143 is plain and STARTTLS. Port 993 is SSL/TLS

Hi @raceface2nd ,
what exactly is your problem?
Is your kopano installed on an HE Virtual server or what’s your environment setup?
If you give us a little more information we might be able to help you.
Have you understood what z-push is for?
best regards

@fbartels : correct, it looks like the ssl settings are not working with the server.
ssl-test shows that the server supports STARTTLS and TLS1.0 and TLS1.1.

@Merlin2104 : Yes, I do know what z-push is for. In this case I do not use z-push with kopano. I want to connect zpush to an owncloud instance and use an imap server for authentication. The imap server has a valid certificate. It’s an IMAP server of the hoster hosteurope

What I did not see, that I tried /notls option. So I changed to /tls. Now it looks like that z-push communicates with the imap server but something with the authentication goes wrong. I do know, that the error message says, that either the username or password or both might be incorrect. But I checked it dozens of times as well with a mail client and I am 100% sure, that the credentials I provided are correct.